Method:1.Heat oil in a vessel.Add chopped onions.and fry until it turns color.2.Add chopped tomatoes and cook until tomatoes are mushy.3.Add ginger garlic paste and fry .4.Peel the potatoes and cube into medium size pieces.Add the potatoes ,turmeric pwd,chillipwd and Coriander powder.Mix well.5.Cover the lid and cook in medium low flame for 10mts.6.To this add coconut paste ,beaten yogurt and mix well.Add garam masala powder and mix well.7.And finally cups of water and cook in medium flame until you get desired consitency.